Drive Ratio

[SilveradoSS]

Hi,

My 2006 2000SR3 with a 5.0l tks and Alpha I has a drive ratio of 1.47:1. I am told by a friend at Mercury Marine that this was not an option in 06. Does anyone know anything about this subject?

it is causing some prop selection problems.

[seapuppy]

nope...according to the manual..on page 633....ie US marine part cross ref..your alpha 1 has a 2.0-1 ratio....your ratio your coming up with would cause a mess of problems....

go with the 2.0-1 ratio..should be right..

SP irate:

[SilveradoSS]

The unit is stamped 1.47;1 on the side. A 18P enertia prop runs 4200 rpm with 44 mph which supports the ratio. 2.0:1 is not offered in the alpha I gen II to the best of my knowledge in 2006. Standard is 1.62:1 and 1.8 somthing for high altitude. What I am concered about is if the previous owner changed it for some reason. The boat only has 40 hours on it. I am worried about a crash or something. The marina where I bought it is looking into it.

If you look at the mercury prop selector web site you will see that only the two ratios were offered in 06. The 1.47 was discontinued in 2000 for the 5.0 TKS.

[seapuppy]

Originally Posted by SilveradoSS

The unit is stamped 1.47;1 on the side. A 18P enertia prop runs 4200 rpm with 44 mph which supports the ratio. 2.0:1 is not offered in the alpha I gen II to the best of my knowledge in 2006. Standard is 1.62:1 and 1.8 somthing for high altitude. What I am concered about is if the previous owner changed it for some reason. The boat only has 40 hours on it. I am worried about a crash or something. The marina where I bought it is looking into it.

If you look at the mercury prop selector web site you will see that only the two ratios were offered in 06. The 1.47 was discontinued in 2000 for the 5.0 TKS.

hmmm...according to the manual and parts catalog reads 2.0-1....wonder where the disconnect is....

I'll have to call my parts guy and ask him...

SP

[SilveradoSS]

Where this came up was when I sold the old boat a 94 2000SR with a 4.3L. I saved my old stainless props and they are all too much prop for the new boat with more HP. For example an 18P Enertia worked great on the 4.3 but is too tall for the 5.0L. The old boat had the 1.62:1 ratio and 210 HP.

[Ticamo]

Check the outdrive serial number against what is recorded on the flame arrestor on the motor. That should tell you whether the drive was replaced. As reported previously here, my drive was mistakenly switched with someone else's when serviced over the winter. That also could explain having a gear ratio that wasn't offered in 2006.

[SilveradoSS]

According to Maxum I have the correct configuration. My marina is giving me a print out tomorrow. I am going to call my friend at Mercury tomorrow and ask a few more questions.